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Ultrafast optical pump-probe spectroscopy is a powerful tool to study dynamics in solid materials on femto- and picosecond timescales. In such experiments, a pump pulse induces dynamics inside a sample by impulsive light-matter interaction,…

We investigate the evolution of coherence property of noise-seeded Stokes wave in short (< 1 ps) and long pulse (> 1 ps) regimes. Nonlinear equations expressing the evolution of pump and Stokes wave are solved numerically for both the…

Optics · Physics 2019-05-22 Partha Mondal , Shailendra K. Varshney

A first-principles-based method for computing phonons of magnetic random solid solutions including thermal magnetic fluctuations is developed. The method takes fluctuations of force constants (FCs) due to magnetic excitations as well as due…

Materials Science · Physics 2019-08-07 Yuji Ikeda , Fritz Körmann , Biswanath Dutta , Abel Carreras , Atsuto Seko , Jörg Neugebauer , Isao Tanaka

In this letter, the characteristics of noise and long-term stability of near- and mid-infrared (near-IR and mid-IR) gas-filled fiber Raman lasers have been investigated for the first time. The results reveal that an increase in Raman pulse…

We propose an explanation for the recently measured slow fluctuations and ``blinking'' in the surface enhanced Raman scattering (SERS) spectrum of single molecules adsorbed on a silver colloidal particle. We suggest that these fluctuations…

Soft Condensed Matter · Physics 2009-11-10 D. B. Lukatsky , G. Haran , S. A. Safran

Exceptional points, a remarkable phenomenon in physical systems, have been exploited for sensing applications. It has been demonstrated recently that it can also utilize as sensory threshold in which the interplay between exceptional-point…

Applied Physics · Physics 2024-10-18 Shirin Panahi , Li-Li Ye , Ying-Cheng Lai

The effects of high pulse intensity and chirp on two-dimensional electronic spectroscopy signals are experimentally investigated in the highly non-perturbative regime using atomic rubidium vapor as clean model system. Data analysis is…

We observe an extraordinary link in the Crab pulsar between the enhancement of an optical pulse and the timing of the corresponding giant radio pulse. At optical through infrared wavelengths, our observations use the high time resolution of…

We show that a scaling law exists for the near resonant dynamics of cold kicked atoms in the presence of a randomly fluctuating pulse amplitude. Analysis of a quasi-classical phase-space representation of the quantum system with noise…

Quantum Physics · Physics 2008-08-29 Mark Sadgrove , Sandro Wimberger , Scott Parkins , Rainer Leonhardt

We consider the statistics of volume fluctuations in a one-dimensional classical gas of non-interacting particles confined by a piston, and subjected to an arbitrary external potential. We show that despite the absence of interactions…

Statistical Mechanics · Physics 2008-07-29 Eric Bertin , Maxime Clusel , Peter C. W. Holdsworth

The excitation of an autoionizing resonance by intense radiation requires a theoretical description beyond the transition probability per unit time. This implies a time-dependent formulation incorporating all features of the radiation…

Quantum Physics · Physics 2019-01-30 G. Mouloudakis , P. Lambropoulos

By using the inverse spectral transform, the SRS equations are solved and the explicit output data is given for arbitrary laser pump and Stokes seed profiles injected on a vacuum of optical phonons. For long duration laser pulses, this…

solv-int · Physics 2009-10-28 C. Claude , J. Leon

The study of the fundamental properties of phonons is crucial to understand their role in applica- tions in quantum information science, where the active use of phonons is currently highly debated. A genuine quantum phenomenon associated…

Mesoscale and Nanoscale Physics · Physics 2018-09-27 Daniel Wigger , Helge Gehring , V. Martin Axt , Doris E. Reiter , Tilmann Kuhn

We provide formulas to compute the coefficients entering the affine scaling needed to get a non-degenerate function for the asymptotic distribution of the maxima of some kind of observable computed along the orbit of a randomly perturbed…

Chaotic Dynamics · Physics 2017-07-26 Davide Faranda , Jorge Milhazes Freitas , Pierre Guiraud , Sandro Vaienti

We discover an unexpected behavior in a hybrid system composed of cavity strongly coupled to molecules and subjected to high intensity coherent pumping. We show that if the frequency of the pumping wave is close to polariton transitions in…

Quantum Physics · Physics 2025-05-09 I. S. Pashkevich , I. V. Doronin , A. A. Zyablovsky , E. S. Andrianov

An interesting analog circuit for simulating a signal with fluctuations having a probability density function with a power tail has recently been proposed and constructed. The exponent of the power law can be fixed by tuning an appropriate…

Statistical Mechanics · Physics 2016-08-16 H. Fanchiotti , C. A. García Canal , N. Martínez

Using cumulant expansion in Gaussian approximation, the internal quantum statistics of damped soliton-like pulses in Kerr media are studied numerically, considering both narrow and finite bandwidth spectral pulse components. It is shown…

Quantum Physics · Physics 2009-10-31 Eduard Schmidt , Ludwig Knoll , Dirk-Gunnar Welsch

We consider a dynamical system which has a stable attractor and which is perturbed by an additive noise. Under some quite typical conditions, the fluctuations from the attractor are intermittent and have a probability distribution with…

Chaotic Dynamics · Physics 2015-02-23 Michael Wilkinson , Robin Guichardaz , Marc Pradas , Alain Pumir

Analysing data that consists of one or more truncated exponential functions is of great interest in a wide range of fields. Data consisting of one or more exponential functions are measured by a wide range of instruments, examples include:…

Other Condensed Matter · Physics 2007-05-23 David Lawunmi

We present a quantitative experimental and theoretical study of shot-to-shot intensity fluctuations in the emitted light of a random laser. A model that clarifies these intrinsic fluctuations is developed. We describe the output versus…

Disordered Systems and Neural Networks · Physics 2007-05-23 Karen L. van der Molen , Allard P. Mosk , Ad Lagendijk